A freight transportation output measure that reflects the shipment's weight and the distance the carrier hauls it; a multiplication of tons hauled and distance traveled.

The movement of one ton of cargo the distance of one statute mile. Domestic ton-miles are calculated by multiplying tons moved by the number of statute miles moved on the water (e.g., 50 short tons moving 200 miles on a waterway would yield 10,000 ton-miles for that waterway). Ton-miles are not computed for ports. For coastwise traffic, the shortest route that safe navigation permits between the port of origin and destination is used to calculate ton-miles.

One ton of freight transported one mile.

The movement of one ton of freight a distance of one mile. Ton-miles are computed by multiplying the weight in tons of each shipment transported by the distance hauled for each movement. Total ton-miles for a carrier are calculated by adding the figure for all movements.

a unit used in comparing freight earnings or expenses. The amount earned form or the cost of hauling a ton of freight one mile.